About your second point, the site guidelines suggest assuming good faith and responding to the strongest possible version of what someone has written. I would interpret that to mean here that "they had no trouble understanding the post but had reservations about it, which felt important to them".

I will also add that I feel characterizing what they have written as nitpicking feels rude and uncharitable.

Personally I appreciated the parent comment because although I enjoyed the article, it didn't completely sit well with me, and the comment helped to clarify why. There are some activities in my life that I've poured years of blood, sweat, and tears into, and I'm realizing as I get older that my goals and dreams with regard to this category of work will probably never be realized. This feels a bit different to the snowboarding narrative, which for all I know may have been chosen not because the writer hasn't been in a situation like mine, but because it's easier to digest and doesn't require a level of vulnerability that would muddy the light-hearted tone of the post.

In any event, I don't feel your hostility is fair or warranted here